On our little 21 foot sailboat we use a 55 thrust trolling motor to move to and from the dock. It is more than enough to do the job, and it is quiet, and no gas has to b stored on the boat. The only down side is that it is a pain in the back side to attach the leads of the motor to the battery and take them off when done. It is really not a big deal, but it is time consuming. Also the leads that attach to the battery can be very hot after using the motor.
What I did was to attach a heavy duty 3 prong 110 electrical plug to the trolling motor cord ( Male ) and made a short pigtail cord with a heavy duty female end on it that attached to the battery. With the 3 prong plug you can not plug the motor in the wrong way. I wanted the female end pigtail coming out of the battery box so there was no open contacts that could short to anything. It works very well and it is quick to just plug and unplug the motor.
Make sure you use heavy duty plugs... a lot of current flows through them and the could get hot.
I made 2 pigtails...one for the deep cycle battery for the motor and one for the battery that is for everything else on the boat. That way I can use that battery if needed and it just takes unplugging one battery and plugging it in to the other. Again it is fast and easy.
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